run_ptest.sh: Correct ptest path
run_ptest.sh: Correct ptest path

In poky, PTEST_PATH is defined as '${libdir}/${BPN}/ptest'.

Signed-off-by: Trung Do <64081e6b7eb2b24289b8a4e51cef9836ddf28af2@toshiba-tsdv.com>

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